Quadric Surfaces

This is an interactive version of a text about quadric surfaces
written by Marlene Dieguez Fernandez. The original portuguese document
is available
here (206 Kb).

You can rotate the objects in the applets below. To do this,
click on the object and, keeping the left button pressed,
drag the mouse. You can also use the keyboard to temporarily change
the operation mode acting over the object:
press
the key “s” to zoom in/zoom out or
the key “t” to translate it and, then, drag the mouse.
The key “w” enables auto-rotation
the key “r” resets the scene to its initial configuration.